Call charging telephone exchange system



Sept. 15, 1931.

A. E. HAGUE 1,823,040

CALL CHARGING TELEPHONE EXCHANGE SYSTEM Filed Aug. 4, 19:50

15 Sheets-Sheet l A TURNEY Sept. 15, 1931. A. E. HAGUE 195339940 CALL CHARGING TELEPHONE EXCHANGE SYSTEM Filed Aug. 4,-1930 l5 Sheets-Sheet 5 MAR GINA L nvvmvmn A. E. HAGUE ATTURALEY Sept. 15, 1931. A. E. HAGUE CALL CHARGING TELEPHONE EXCHANGE SYSTEM 15 Sheets-Sheet 4 Filed Aug. 4, 1930 //Vl/E/VTO/? A. E. HABUE BY gfifrw A 7' TUH/VE Y M E T s Y s E G N A w E u m mm m EL E A T G N I G R A H C L L A C Sept. 15, 1931.

Filed Aug. 4. 1930 15 Sheets-Sheet 5 lNl/ENTOR A. E. HAsuE BY @aaw ATTORNEY.

-Sept. 15, 1931.

CALL

A. E. HAGUE CHARGING TELEPHQNE EXCHANGE SYSTEM Filed Aug. 4, 1930 15 Sheets-Sheet 6- @adw A 7' TURN/5) Sept. 15, 12931. A. EQHAGUE 1,823,040

' CALL CHARGING TELEPHONE EXCHANGE SYSTEM Filed Aug. 4,. 1930 15 Sheets-Sheet 7 A T TUHNE Y Y Sept. 15, 1931. A. E. HAGUE 23,

CALL CHARGING TELEPHONE EXCHANGE SYS'I'EI Filed Au 4. 1950 15 Sheets-Sheet a lNI/ENTUH A. 5 HA G'UE' A T TUHNE Y Sept. 15, 1931. A. E. HAC E UE 1,823,040 CALL CHARGING TELEPHONE EXCHANGE SYSTEM Filed Aug. 4, 1930 15 Sheets-Sheet 9 Sept. 15, 1931. A. E. HAGUE CALL CHARGING TELEPHONE EXCHANGE SYSTEM 15 Shiaets-Sheet 10 Filed Aug. 4, 1930 Q3 Q Q 39 /NI/E/V7Z7f? A. 5 H4505 BY v A T TURNE) Sept. 15, 1931. A. E. HAGUE CALL CHARGING TELEPHONE EXCHANGE SYSTEM 'F'iled Aug. 4, 1930 15 Shaw-Sheet 11 INVENTUH A. [IT/14am;- By

Sept. 15, 1931. A. E. HAGUE CALL CHARGING TELEPHONE EXCHANGE SYSTEM 15 Sheets-Sheet 12 Filed Aug. 4, 1930 ATTORNEY Sept. 15 1931.

AL HAGUE CALL CHARGING TELEPHONE EXCHANGE SYSTEM Filed Aug. 4, 1930 15 Sheets- Shet 13 wk H m w w A. E. hxasua BY Sept. 15, 1931.

A. E. HAGUE CALL CHARGING TELEPHONE EXCHANGE SYSTEM Filed Aug. 4, 1930 15 Sheets-Sheet 14 //V VE N 70/? A. t. h'Ac-ws A T T/JHA/EY Sept. 15, 1931. A. E. HAGUE 1,823,040

CALL CHARGING TELEPHONE EXCHANGE SYSTEM Filed Aug. 4, 1930 15 Sheets-Sheet 15 2 'Qj 2 1k ubu 5 5 {if g g mu c 3 l1: 5*?6 L Q Li Q 9 9' :l :I [H LQLKLKLK l'h l 1 w k uufi uuu i #vvavma Ali/7146415 wam'w and in which charges are means of coin boxes associated with substa- Patented Sept. 15, 1931 'ATENT 'FFICE ALFRED E. HAGUE, OF VJEST ORANGE, NEW JERSEY, ASSIGNOR TO BELL TELFDEHONE LABORATORIES, INGOIiPORATE-D, 6F IJEVT YORK, N. Y., A COBPDRA'IION OF NEW YORK CALL CHARGING TELEPTrZC-NE EXCI-IANGE SYSTEM Application filed. August 4, 1930. Serial No. 472,988.

This invention relates to telephone exchange systems and more particularly to systems in which automatic switches are old ployed in the establishment of connections 's ssed for calls by t ons of calling lines.

An object of the lnvention is to enable the subscriber to continue a conversation over a a plurality of unit periods of conversation by the collection of acoin or token for each elapsed period, through the provision of apparatus which is used in common for a plurality of established connections.

In automatic telephone systems where connections are established under the control of register senders, these senders are associated with a calling subscribers line during the establishment of a connection and then dismissed. If the calling line is equipped with a coin box, it is to collect or refund the coin. The most customary manner of collecting the deposited coin has been to reassociate a register sender with an estab lished connectionfolloi the termination of the conversation and to apply coin box operating current from the sender. Since a register sender is a complex and expensive organiZatiOn, it hasbeen found desirable to reduce the time during which it is employed in connection with each call in order that the total number of senders necessary to serve an exchange oifice may be reduced to the least number consistent with good service.

To obviatethe necessity for reassociating te r sender with an established connecfor the purpose of coin box operation, nple coin box control circuit has been devised which like the registersende'rs may be used in common by anyone of a plurality of established conncc ions. A plurality of these common control circuitscis provided, any one of which may be seized and associated with an established connection upon the termination of the conversation over the established connection. A circuit of this character is di closed in the Patent 1,575,836, issued March 2, 1926 to I. H. Henry.

The methods of controlling coil collection, above referred to, however make provision for charging'for an established connection only on the basis of a single charge for the period of conversation. In order, however, that for extended conversations the operating company may be more equitably compensated, it is desirable that the initial period of conversation for a single toll charge be automatically timed and limited and that if the conversation continues beyond this limit, an additional coin shall he demanded and collected for each successive unit period of conversation.

In accordance with the presentinvention, this desirable function has been incorporated in circuits which are in some respects similar to the circuit disclosed in the aforementioned patent to I. H. Henry. Each line finder district link is therefore provided with a timing switch which is started upon the response of; the called subscriber and advances through a cycle to measure the prescribed unit period for conversation. Common to a group of line finder district links a plurality of coin box control circuitsis provided eachequipped with apparatus for eitherapplying coin collecting or coin refunding current to the coin box of the calling line and each having individual thereto a hunting switch for associating the control circuit with a line finder district selector link circuit.

The timing circuit is arranged to close a start circuit for all idle coin control circuit switches just prior to the completion of its timing cycle for causing the association of an idle control circuit with the link. The first idle control circuit switch to find thelink is arrested to seize the link and the other hunting switches of other control circuits are also arrested. Upon the association of the control circuit with the link, the calling line is disconnected from the repeating coil of the district link and connected to the control circuit whereby coin collecting current is transmitted from the control circuit to the coin box of thecalling line for collecting the deposited coin. As soon as the coin has been collected the control circuit is dismissed and as the timing switch of the link continues its cycle a lamp is lighted at an operators position to inform her that the initial period of conversation is about completed.

The operator thereupon plugs a cord circuit of her position into a ack of the link for the purpose of determining if the calllng subscriber desires to continue the conversation for an additional ovcrtnne period. If

the subscriber intimates that he desires to so continue by depositing an additional coin, the operator then disconnects and the timing switch advances through another cycle, again causing the associa ion of a control circuit with the link for the collection of the deposited coin. The circuits then continue to function in this manner as long as the calling subscriber desires to maintain the connec tion and deposits a coin for each additional overtime period of conversation.

The control circuit is arranged to refund a deposited coin if the call has been established to an operators position or for other reasons no charge should be made. 7

A clearer understanding of the purpose and scope of the invention will be obtained from a consideration of the following description in connection with the attached drawings in which:

Fig. 1 shows one of a group of subscribers lines together with the trip circuit serving the group;

Fig. 2 shows a start circuit serving a plurality of groups of lines;

Figs. 3 and 13. taken together show a line finder district selector link circuit for extending a connection from the calling line, Fig. 3

showing the line finder and Fig. 13 showing the district selector together with a sequence switch for controlling the circuits of the line finder and district selector;

Fig. 4 shows one ofa plurality of link circuits serving the subgroup including the calling line 100;

Figs. 5 to 10 inclusive and Fig. 12 show the circuits of a regis er sender adapted to be selected by the link circuit of Fig. 4 and to control selector switches in their selective movements; i

Fig. 11 shows one of a plurality of coin box control circuits embodying in part the pres ent invention Fig.14; shows a timing circuit individual to the line finder district selector link circuit of Figs. 3 and 13;

Fig. 15 shows in diagrammatic form the switches necessary to establish connections from the district selector of 13. and

' Fig. 16 is a diagram showing the manner in which the several figures of the drawing should be arranged to show the complete circuits of the invention.

Subscribers lines such as line 100 are connected to multiple terminals appearing before a plurality of line finders. These multiple terminals are arranged in a plurality of groups each group being served by a separate brush set on each finder and each group being divided into two subgroups. A trip circuit is provided individual to each group; a start circuit is provided for all the groups of lines served by the group'of line finders; and a plurality of link circuits is provided for each group of lines and line finders. The line finders and link circuits are divided into two subgroups andeach subgroup normally serves calls in the corresponding subgroup of lines. The arrangement is such that, except when all link circuits are busy, a particular link circuit will be in readiness to serve a call and will be connected by its district finder to an idle line finder.

When a call is initiated by a subscriber in a particular group, the trip circuit individual to the group, and the start circuit are taken for use by that line and means are provided for preventing the extension of a call in the other subgroup of the group or in any other group until the line finder has been started in search of this calling line. Means are also provided for preventing the extension of a second call in this group until after simultaneous calls in other groups have been taken care of. The operation of the start circuit causes the line finder associated with the link circuit allotted for use, to hunt for the calling line and also causes the link circuit to huntfor an idle sender. As soon as a particular link is taken for use with a call the next link is allotted to serve the next initiated call in the particular subgroups which it serves. As soon as a brush set on the line finder has been tripped the start circuit will be freed to ermit the extension of calls in other groups. As soon as the line has been found the trip circuit of the group is freed by the line finder to extend another call in the same group pro vided no call is awaiting extension in another group. As soon as selections are completed the sender and link circuit are released by the district selector circuit and the link circuit immediately hunts for another idle district selector.

Substation 100 is one at which a coin box is located for the purpose of requiring prepayment for calls. Substations of this t e are served by reg ster senders which are ar ranged to prevent the com letion of a connection unless the required coin is deposited in said coin box.

Extension of a. local connection When the subscriber at substation 100 removes his receiver from the switchhook a circuit is closed for line relay 101 extending from battery through that relay, inner contact of relay 102 over the line loop to ground at the outer contact of relay 102. Relay 101 operates and closes a circuit from battery, through the left winding of relay 103, right back contact of relay 104 to ground at the outer contact of relay 101, and at its'inner I left contacts of cam 1301 front contact connects battery through resistance 111. and the left winding of relay 109 in parallel to conductor 11 1 to mark the line as calling.

The operation of relay 103 opens at its right baclr contact the operating circuit of relay 1. -1 which serves the second subgroup of the group to which line 100 belongs thus preventing the extension of a connection from that subgroup while the trip circuit being used with line 100. it its middle left contact relay 103 establishes a circuit for the trip relay 108 extending from battery, leit back contact of relay 201, conductor 130, right winding of relay 108, inner left back contact of relay 107, left back Con act of relay 100 to ground at the i iddle l front contact of relay 103. Relay 10 operates and t t windloclrs from battery, through U mg of relay 201, conductor 129, back contacts of relays similar to relay 108 individual to other subgroups of lines appearing before the same line finder, inner left front contac and left winding of relay 108, right b cl; contact of relay 109 to ground at the middle left front contact of relay 103. Relay 108 at its outer right front contact eat circuit for operating the trip magnet 303 of the line finder of Fig. 3. Relay 201 ope] .e in the locking circuit of relay 108 and'ia combination therewith closes a circuit from ground at its outer right contacts, over conductor 128, the inner right front contact of relay 108 to battery through the winding of relay 110. Relay 110 operates and locks over its inner right contact, the le baclr contact of relay 109 to ground at the n i .dle left contact of relay 103 and at its outer contact establishes a circuit for starting an allotted line finder.

Assuming tha" shown are the one.

the linli and line finder 3 to be used next, sequence switch 100 will be standing in position 1 and sequence switch 1300 in position The operation of relay 110 will therefore close a circuit from ground at outer right contact. the outer left front cor t ct of relay 108, the inner left front contact of rela 103, can ductor 131, the left back contacts of relay 202, the left back contacts of relay 203, conductor 206, the upper left and lower right contacts of cam 403, brush 402 and terminal 401, conductor 3. 8, the low-er ri ht and upper the winding of relay 302.

Relay 302'in operating c circuit for itself over its inner ri ht front contact, the lower and upper let cam 1302, the back con 1'' ground over commuta act ' r s brush 305, and at 102 opens the circui left contact of cam 130 The line finder moves upwardly under the control of mag net 300 and since trip magnet 303 is operated, the proper set of brushes is tripped. Relay 302 also establishes a circuit from ground at the upper left contact of cam 1304, over the outer right front contact of relay 302, lower left contact of cam 1305, conductor 3T9, terll L07, brush 106, upper right and lower "ft contacts of cam :05, conductor 207, right vinding of relay 203 to battery atthe inner eft normal contacts of relay 208. Relay 203 )erates and opens at its left back contacts 'nitial operating circuit of relay 302. As

as commutator brush 306 engages segment 307 a circuit is established from ground on brush 300, left contacts of cam 1306, conductor 10 1 Contact 2300f lrey 204:, inner right con .ct of relay 201 to conductor 129 and'the rlg t contactof relay 201. This circuit shuns; the winding of relay 108 and causes that relay to release in turn releasing the trip magnet 303. lVhen brush 306 leaves segment the circuit of relay 201 is opened and that r-s ay also releases. When the line brush 308 makes contact with terminal 309 which is connected to conductor 11 1 and therefore to battery, a circuit is completed from this battery, conductor 316, outer right back contact of relay 310, conductor 311, upper contact of cam 1401, conductor 312, winding of relay 301, conducto 313, upper left and lower ght contacts of cam 1307 to ground. Relay 301 operates in this circuit and closes a shunt around its winding from ground on brush 305, segin nt 301, front contact of relay 301, conductor 31 1, left contact of cam 1 102, conductor 315, resistance 1308, conductor 316 to brush 308. This reduces the resistance in series with the winding of marrelay 109 sufficiently to cause that relay to operate and open the locking circuit of relay 110. The operation of relay 301 also opens the locking circuit previously traced for relay 302 and relay 302 releases soon as the line finder brushes are centered on he calling line terminals when commutator brush 311'- will be in engagement with an insulating portion of centering segment 318. The release of relay 302 opensthe circuit of up-drive 300 and establi es the cir cnit of cut-off relay 102 from battery, through the winding of relay 102, conductor 112, terminal 319, brush 320, resistance 1300, outer left back contact of relay 310, middle right back contact of rela: 302, upper contacts of cam 1310 to ground the lower contact of 1311. The oper tion of cut-elf relay 'c of line relay 101 removing battery from conductor 11% releasing relays 109 and 301. l 7

At the time relay 302 operated and closed a circuit frcinground over conductor 3Y9, terminal 407, brush 106, for operating relay 203, a circuit was also established from brush .of relay 409 to battery through resistance 411. Relay 409 operates and closes a circuit from battery, through the winding of sequence switch magnet 400, upper Contact of cam 412 to ground at the outer left front contact of relay 409, advancing sequence switch 400 to position 2. vVhen sequence switch 400 leaves position 1 relay 409 release 1n position 2 a circuiiis closed from battery, through the winding of relay 413, left contacts cam 414, right back contact of relay 415 to ground at the upper right contact of cam 416. Relay 413 operates closing a circuit from battery, through the left winding of relay 417, right front contact of relay 413 to ground at the left back contact of relay 415. Relay 417 in operating closes a circuit from battery, through the winding of up drive magnet 418 of the sender finder 420, left contact of cam 479, outer right contact of relay 417 to ground at the left back contact of relay 409. The sender finder moves upwardly under the control of magnet 418 in search of an idle sender.

Relay 413 also closes a circuit from battery, through the right winding of relay 415, left contacts of cam 421, middle winding of relay 415 to ground at the left front contact of relay 413. The current in this circuit, however, is not sufficient to operate relay 415, but does create a fluxin its magnetic circuit so that it becomes quick to operate when the test circuit is closed. The test circuit extends from brush 422, over the lower contacts of cam 419, right back contact of relay 409, left winding of relay 415, upper right and lower left contacts of cam 421, middle winding of relay 415 to ground through the left front contact of relay 413. An idle sender is characterized by battery connected over conducfor 502 to terminal 423. When therefore 1 brush 422 engages terminal corresponding to the sender of 5 to 10 inclusive, which is assumed to be idle, the test circuit is completed over conductor 502, back contacts of relay 510 and 512 to battery through re sistance 501 and relay 415 operates quickly closing a locking circuit for itself from battery through right winding, left contacts of cam 421 to ground at its left front contact. it also opens the circuit of relay 417 w ich releases to in turn release magnet 418 to bring the sender finder to test on the terminals of the idle sender. The release of relay 417 in turn releases relay 413. VJith relay 413 released and relay 415 operated a circuit is closed from battery, through the winding of sequence switch magnet 400, upper left contact of cam 476, contacts 427 of jack 428, left back contact of relay 413, right front contact of relay 415 to ground at the upper right contact of cam 416 advancing sequence switch 400 to position 3.

Then sequence switch 400 advanced to p0- sition 2 to hunt for an idle sender a circuit was closed for relay 321 extending from bat-.

tery, right winding of relay 321, lower left contact of cam 1312, lower right contact of cam 1313, conductor 375, terminal 477, brush 478 to ground at the right contact of cam 429. lVhen relay 302 releases as above described with relay 321 operated, a circuit is closed for advancing sequence switch 1300 into position 3 extending from battery, winding of magnet 1300, upper left contact of cam 1314, left front contact of relay 321, outer right back contact of relay 302 to ground at the upper left contact of cam 1304. As sequence switch 1300 advances from position 2 to 3 relay 321 releases. From position 3 to 17 the calling line cut-0E relay 102 is maintained operated over terminal 319, brush 320, re sistance 1309, the left back contact of relay 310 to ground at the upper right contact of cam 1311.

WVhen sequence switch 400 reaches position 3 a circuit is closed from ground, through the right and middle windings of relay 503, inner left back contact of relay 504, outer right back contact of relay 505, conductor 506, terminal 430, brush 431, upper contact of cam 434, brush 432 and terminal 433, conductor 322, lower right and upper left contact-s of cam 1315 to battery through the winding of relay 323 and in parallel therewith over the upper right contact of cam 1315, lower'contacts of cam 1403, conductor 339 to battery hrough the left winding of relay 324. Relay 324 is marginal and does not operate and relay 323 although operating is not effective at this time. Relay 503 also operates and closes an obvious circuit for relay 507 which in turn closes a circuit from battery, through resisance 508, winding of relay 509, middle left front contact of relay 507 to ground. Relay 509 operates and locks over its inner right front contact. Relay 507 closes a circuit for relay 510 from battery, winding of relay 510, conductor 534 to ground at lhe inner left front contact of relay 507. It also closes a circuit from battery, through the winding and right normal contact of relay 601, normal contact of brush 602 of timing switch 600 and thence to ground over conductor 534 to the inner right front contact of relay 507. The operation of relay 510 closes an obvious circuit for relay 511 which in turn closes a circuit through the lef, winding of relay 512. The operation of relay 601 closes a circuit from battery, through the winding of relay 603, normal terminal and brush 604 of switch 600, inner left front contact of relay 601 to ground. Relay 603 opera es and closes a circuit through the winding of stepping magnet 605 and its back contact, front contact of relay 603, brush 604 and its normal terminal to ground at the inner left contact of relay 601. Magnet 605 operates and steps switch 600 to its first terininal. The further operation of the timing switch will be described later.

The operation of relay 512 opens the circuit previously traced through battery and resistance 501 and the windings of relay 415 and relay 415 releases Yilith relay 415 r leased a circuit is closed from battery, through the winding of sequence switch mag net 400, lower left contact of cam 47 6, right back contact of relay 415 to ground at the upper right contact of cam 416. Sequence switch 400 advances to position over this circuit and remains in this position throughout the further operation of ih sender.

As soon as sequence switch 400 arrived in position 2% it prepared a pulsing circuit for receiving dial pulses. This circuit may be traced from battery, through the left windin of rela 606 conductor 037 left back con;

tact of relay 1200, left back contact of relay 1201, conductor 1202, terminal 445, brush 444, lower left and upper right contacts of cam 403, brush 443, terminal 442, conductor 382, left contact of cam 1316, winding of relay 1317, outer right back contact of relay brush 325, terminal 326, line conductor 116, substation of calling line 100, line conductor 117, terminal 327, brush 328, inner right back contact of relay left contact of cam 1318, conductor 375, terminal 477, brush 478, lower contact of cam 429, brush 441, terminal 440, conductor 1203, right back contact of relay 1204,right back contact of relay 1200 to ground. Relay 606 operates and closes a circuit for relay 610 extending from battery through the winding of relay 610,, front contact of relay606 to ground at the inner left back contact of relay 515. Relay 610 operates and closes a circuit from battery, through the winding of relay 609, right front contact of relay 610, conductor 638, lower left contact of cam 516 to ground. As soon as relay 609 operates the dialing tone circuit is completed from source of tone 607, right winding of relay 606, normal terminal and brush 804 of register steering switch 800, outermost left contact of relay 609, conductor 618, lower contact of cam 514, conductor 534 to ground at the inner left front contact of 507. Due to the closure of this circuit a tone is induced in the left winding of relay 606 and over the dialing circuit to the receiver of the calling subscribers substation to indicate that dialing may be started.

The subscriber now dials the number of the wanted subscriber and the registers 810, 820, 1000, 1010, 1020, 1030 and 1040 are positioned as described in the patent to O. H. Kopp, No. 1,589,402, granted June 22, 1926. As soon as registers 810 and 820 are set translator 830 is positioned to control various selections after which class sequence switch 950 is positioned. As soon as the translator is positioned sequence switch 500 is advanced to position 2.

lVith sequence switch 500 in, position 2' the fundamental circuit is completed from battery, through the right winding of relay 321,

lower left contact of cam 1312, lower left contact of cam 1313, conductor 37 8, terminal 401, lrush 402, lower right and upper left contacts. of canr435, brush 436, terminal 437, right back contact of relay 504, right contact of cam 701, winding of stepping relay 702, back contactof relay 703, left winding of relay 7 04, left contact of cam 7 05, inner left contact of relay 620, middle leftvcontact of relay 621, resistance 623 to ground, relays 620 and 621 having energized upon the setting of the translator switch 830 in the manner set forth in the aforementioned patent to O. H. Kopp. Relays 321 and 702 operate in this circuit, but relay 704 being polarized does not operate. Relay 321 locks over its inner right front contact, the upper left contact of cam 1312 to the fundamental circuit as previously traced. Relay 321 also closes a circuit from battery, through the winding of sequence switch magnet 1300, upper left contact of cam 1314, .left front contact of relay 321, outer .right backcontact of relay 302 to. ground at the upper-left contact of cam 1304. Magnet 1300 energizes in this circuit and advances the sequence switch into position 4 in which position the energizing circuit for relay 321 is opened, but the looking circuit is maintainedv closed. in position 4 with relay 321 operated a circuit is closed from battery, through the winds ing of up-drive magnet 1319, lower contacts of cam 1310, left front contact of relay 321, outer right back contact of relay 302 to ground at the upper left contact of cam 1304. The rip-drive magnet energizes in, this. circuit and causes the district selector switch shaft to move upwardly in a brush selecting move.- ment. Each time that brush 1320 makes contact with a conducting segment of 0011111111,; tater strip 1321 a circuit is established from ground at the lower contact of canl 1311, brush 1320, segment 1321, upper left contact of cain 1313, thence to the fundamental circuit holding relay 321 operated and shunting the sender stepping relay.

lVhen the fundamental circuit above traced was closed and stepping relay 702 operated, it closed a circuit from battery, inner left contact of relay 621, left contact of cam 519, winding of thello. 3 counting relay, (assuming that the translator has been set in position to select the fourth brush on the district selector) back contact of the No. 3 counting relay, conductor 706, translator brush 855 and its corresponding terminal, right contacts of cam 707, inner left back con tact of relay 708, left contact of cam 520, contact of relay 702, lower left contact-of cam 518 to ground. The No. 3 counting relay operates in this circuit andloclrs through the winding of the No. 3 counting relay, front 

